Description: This function deletes the selected surfaces from the database.
Usage:
1. DSI prompts the user to select a surface on the screen.
2. The user may select surfaces by part (list or screen pick) or by selecting displayed surfaces using the mouse
3. Surfaces will be highlighted as they are selected
4. Surfaces may be de-selected by selecting REJECT LAST from the menu
5. The surface are deleted from the database when the EXIT command is executed